linux-kernel - Re: [REGRESSION] [BISECTED] drm/sun4i: hdmi: No HDMI output with BananaPI M1 on 6.9

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aDSdQwwMYQHYX5Rn@a98shuttle.de>
Date: Mon, 26 May 2025 18:56:35 +0200
From: Michael Klein <michael@...sekall.de>
To: Maxime Ripard <mripard@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
	regressions@...ts.linux.dev
Subject: Re: [REGRESSION] [BISECTED] drm/sun4i: hdmi: No HDMI output with
 BananaPI M1 on 6.9

On Mon, May 12, 2025 at 10:27:07PM +0200, Michael wrote:
>with v6.9 and later there is no output on the BananaPI HDMI connector.
>
>I have bisected the issue to the following commit:
>
>  358e76fd613a ("drm/sun4i: hdmi: Consolidate atomic_check and mode_valid")
>
>With this patch, sun4i_hdmi_connector_clock_valid() is occasionally 
>called with clock=0, causing the function to return MODE_NOCLOCK.
>In the old sun4i_hdmi_mode_valid() before the patch, mode->clock is 
>always!=0, maybe that gives someone a hint.

#regzbot introduced: 358e76fd613a